This set is worth over 20,000 yen in total. How about it for advance learning before entering school, or as a supplement to what you are currently using? Textbook: Regular price ¥2800 Social Studies: A few pages have lines drawn on them. About 6 pages. Workbook: Regular price: ¥1500 Mathematics has two books: Geometry and Quantity/Function editions. I bought the textbooks and workbooks early before entering school, but since there were school-specified materials, I studied with those, so I hardly used these. Except for the social studies book, it feels like they haven't been opened. Except for the social studies textbook, which has a few pages with lines drawn on them, they are as good as new. 2016 or 2017 revised edition. A set of study guides and workbooks.